Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84adc9b3e917dee…

MALICIOUS

PDF

87.1 KB Created: 2021-02-18 20:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ebabca6a1cd00eee5e92b32e86f90926 SHA-1: 9b19c5386ff706294f991d715cb074001f0b6aa4 SHA-256: a84adc9b3e917dee6ca47781b178c65aef251324e34dd132f6d09bce8b86a140
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/strik?utm_term=nursing+theories+models+and+frameworks PDF link annotation
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/56f7df5e8b3015c.pdfIn PDF document text
    • http://presente-top.store/black_platform_court_shoes_uk67275.pdfIn PDF document text
    • http://ductsunlimitedins.com/tutefelutezubiqrrgh.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/8A9x35L/79014056925.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/YhjcUgF/74127956648.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/gilLCRA/demand_management_definition_economics.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/6StCgcp/eas_simulator_pro_free_download.pdfIn PDF document text
    • http://soldatskaya6.ru/efficiently_inefficient_how_smart_money_investsm5916.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/4308318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_600c3804eba06.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/c43232cfc3a4b.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/bajodejokiwi.pdfIn PDF document text
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/supezoju.pdfIn PDF document text
    • https://cdn.sqhk.co/gopilufifeda/8gcgdKh/video_and_gif_memes_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/hfggVgc/51663406891.pdfIn PDF document text
    • http://my-favshopg.online/laminas_test_de_raven_nios_para_imprimirnpzgp.pdfIn PDF document text
    • http://hookup681.site/witer6bjvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 5328 bytes
SHA-256: bdfcd5253b01c333dfca61daa7d5705c160d5f3a886e7388e47fb979a6c59709
font_01_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 11124 bytes
SHA-256: 74584ba8a2ed4aa27e1a3e62c96064fdcf1718884c8412c956f3978bcf659469
font_02_sfnt_off000140d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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